Someone plez talk with me? please?

Which best explains why this triangle is or is not a right triangle?

Adam plans to choose a video game from the section of the store where everything is 75% off. he writes the expression d-0.75d to find the sale price of the game if the original price is d dollars. gena correctly writes another expression, 0.25d, that will also find the sale price of the game if the original price is d dollars. use the drop down menus to explain each part of adams and rena's expression

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4